Hi,
I am new here.. I don't know whether this is the correct place to start the thread. I need to make a 1 kW 75 MHz amplifier using 5CX1500A. I have tested one successfully using pi L-C matching network. I do not know much about coaxial cavity based amplifiers. I would like some guidance to make a 2 kW amplifier at 75 MHZ and 350 MHz using coaxial cavities over 5CX1500A pentode.
From what I have understood, the cavity should be at least lambda/4 long with movable shorts. provision for cooling and dc isolation are required. Coupling can be loop or capacitive type. There should be an anode tuning capacitor. Please correct me if I am wrong. How is the ideal position of the coupling decided? What are the moving/tuning parts in both types of coupling?
I am looking for any design resources, formulae or suggestions from you people relating to this type of amplifiers. Thanks in advance.
I am new here.. I don't know whether this is the correct place to start the thread. I need to make a 1 kW 75 MHz amplifier using 5CX1500A. I have tested one successfully using pi L-C matching network. I do not know much about coaxial cavity based amplifiers. I would like some guidance to make a 2 kW amplifier at 75 MHZ and 350 MHz using coaxial cavities over 5CX1500A pentode.
From what I have understood, the cavity should be at least lambda/4 long with movable shorts. provision for cooling and dc isolation are required. Coupling can be loop or capacitive type. There should be an anode tuning capacitor. Please correct me if I am wrong. How is the ideal position of the coupling decided? What are the moving/tuning parts in both types of coupling?
I am looking for any design resources, formulae or suggestions from you people relating to this type of amplifiers. Thanks in advance.